Plug and Play: If your car has a Harman, Kardon or BOSE amplifier system, an additional optical fiber box is required. Decode your BOSE or Harman or Kardon with the fiber optic box (ASIN: B0G29K34L7, It will keep your original amplifier system, like Harman, Kardon, BOSE audio system working.) All cables only need to be connected at the front. Easy to install, plug and play.